Turb

Okay so I'm looking to buy a 240 with an sr20 red top has a hks blow off valve if that matters and I was wondering if -17 vacuum is really low, like if it has boost leaks? Thanks in advance

KAT-PWR

You should boost leak test it regardless.

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MRP Manufacturing

Turb

I may sound like a complete retard but how do I do that?

bmxer882x

Get a pvc cap, drill a hole in it.
Put a valve stem in the hole.
Put it in the coupler hot side of the turbo.
Hook air compressor to valve stem.
Apply air (boost) to system. Listen for leaks.

Also, my sr idled at -18 with no issues.

KAT-PWR

He means attach it to your cold side intercooler piping, but this is correct.
One of my friends had an aluminum 3" hose end welded to an NPT fitting that threads onto a digital tire pressure unit so he can fill to specific psi and check for leaks. Pretty neat.

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Gingersmurf

If you're just looking for leaks in your intercooler piping, etc. Use the cap method, and hook up it up to an air compressor to like 5-10PSI and spray soapy water to all the couplers and if there's a leak, you will see bubbles forming

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Turb

thanks for the help guys!